=. Mi 
Isoetes Melanopoda Gay in litt. Apr. 1863; Du Rieu de 
Maisonn. in Bull. de la soc. bot. d. France XI. (1864) p. 102. 
Vegetatio amphibia vel subterrestris. Rhizoma subglobosum 
deorsum intumescens, sulco angusto in lobos duos rotundatos 
radicibus ubique obsitos divisum, sursum foliorum faseiculum 
gerens basi bulbi instar consertum, erectum vel modice diver- 
gentem. Foliorum vagina squamiformis dorso praeter mar- 
inem hyalinum fusco-nigricans, nitida, rarius (in specimini- 
us aquaticis?) fusco-variegata vel pallida; lamina subulata, 
angusta, rigidiuscula, utrinque acute marginata, antice plana 
vel medio paullulum elevata, dorso valde convexa et carinata, 
fasciculis fibrosis periphericis primariis 4 et in latere postico 
accessoris minoribus utringue 4—8 percursa, stomatibus 
crebris instructa. Velum angustum vel angustissimum, utrinque 
longe decurrens. Labium productum, obtusum vel truncatum, 
saepius bifidum, rarius acuminatum Lingula magna, cordata, 
labio triplo longior, tugacissima. Epidermis sporangiorum 
cellulis sclerenchymaticis erebris varie junctis fuscescentibus 
signata. Microsporae tuberculis minutis acutiusculis praeser- 
tim in statu sieco conspicuis quasi denticulatae. Macrosporae 
omnium minimae, 0,30—0,40 mm. crassae, albae, depresso- 
globosae, angulis verticis nec non angulo eirculari angustis 
parum prominentibus, faciebus omnibus tuberculis minutissi- 
mis dense congestis parum elevatis et passim subconfluentibus 
exasperatis. 
Marsilia Drummondit A. Br. in Linnaea XXV. (1852) 
p. 721; Monatsb. d. Ak. d. W. Oct. 1863, p. 426 M. ma- 
eropus Hook. Ic. pl. X. (1854) t. 909 (non Engelm.). Spe- 
ciosa, robusta, rhizomate plantae fructiferae dense constipato, 
Foliola late spathulata, integerrima vel fronte obiter crenu- 
lata, dense villosa, superficie demum glabrescentia, decrepita 
flavescentia vel luteo-fuscescentia. Sporocarpia ex infima basi 
petiolorum solitarie vel rarius geminatim orta, pedunculo 
triplo vel quadruplo longiore strieto suflulta, adscendentia, 
modice compressa, oblique ovata, secus lineam dorsalem recta, 
linea ventrali valde convexa, apice valde obliqua, ad maturi- 
tatem usque pilis argenteo-canescentibus vestita, depilata fusco- 
lutea, vix conspicue costata. Dentes ad basin superiorem 
sporocarpii approximati, breves, obtusi, superior latior demum 
(in fructu bene maturo) decorticatus atronitens. Sori utrin- 
- que 6—10. 
M. (Drummondiü var.) macra A. Br. Omni parte minor 
et tenuior, rhizomate minus constipato. Pedunculus sporo- 
carpio duplo triplove tantum longior, minus strietus. Sporo- 
carpium fere horizontale, brevius et magis tumidum, nonnun- 
quam linea dorsali concava sursum curvatum, pilis arctius 
